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1756, from West Indies chigoe (1660s), possibly from Carib, or from or influenced by words from African languages (e.g. Wolof and Yoruba jiga "insect").
The six-legged larva of mites of the family Trombiculidae, parasitic on humans and other vertebrates and inflicting a bite that produces a wheal accompanied by intense itching. Also called harvest bug, harvest mite, jigger, red bug.